title: Neuronal activation in the central nervous system of rats in the initial stage of chronic kidney disease-modulatory effects of losartan and moxonidine.
abstract: The effect of mild chronic renal failure (CRF) induced by 4/6-nephrectomy (4/6NX) on central neuronal activations was investigated by c-Fos immunohistochemistry staining and compared to sham-operated rats. In the 4/6 NX rats also the effect of the angiotensin receptor blocker, losartan, and the central sympatholyticum moxonidine was studied for two months. In serial brain sections Fos-immunoreactive neurons were localized and classified semiquantitatively. In 37 brain areas/nuclei several neurons with different functional properties were strongly affected in 4/6NX. It elicited a moderate to high Fos-activity in areas responsible for the monoaminergic innervation of the cerebral cortex, the limbic system, the thalamus and hypothalamus (e.g. noradrenergic neurons of the locus coeruleus, serotonergic neurons in dorsal raphe, histaminergic neurons in the tuberomamillary nucleus). Other monoaminergic cell groups (A5 noradrenaline, C1 adrenaline, medullary raphe serotonin neurons) and neurons in the hypothalamic paraventricular nucleus (innervating the sympathetic preganglionic neurons and affecting the peripheral sympathetic outflow) did not show Fos-activity. Stress- and pain-sensitive cortical/subcortical areas, neurons in the limbic system, the hypothalamus and the circumventricular organs were also affected by 4/6NX. Administration of losartan and more strongly moxonidine modulated most effects and particularly inhibited Fos-activity in locus coeruleus neurons. In conclusion, 4/6NX elicits high activity in central sympathetic, stress- and pain-related brain areas as well as in the limbic system, which can be ameliorated by losartan and particularly by moxonidine. These changes indicate a high sensitivity of CNS in initial stages of CKD which could be causative in clinical disturbances.
authors.affiliation: Neuromorphological and Neuroendocrine Research Laboratory, Semmelweis University and the Hungarian Academy of Sciences, Budapest, Hungary.
authors.forename: Miklós
authors.initials: M
authors.lastname: Palkovits
authors.forename: Katarína
authors.initials: K
authors.lastname: Šebeková
authors.forename: Kristina Simon
authors.initials: KS
authors.lastname: Klenovics
authors.forename: Anton
authors.initials: A
authors.lastname: Kebis
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Fazeli
authors.forename: Udo
authors.initials: U
authors.lastname: Bahner
authors.forename: August
authors.initials: A
authors.lastname: Heidland
mesh_terms: D047228:Angiotensin II Type 1 Receptor Blockers / Q000494:pharmacology; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D002490:Central Nervous System / Q000187:drug effects* / Q000378:metabolism; D007093:Imidazoles / Q000494:pharmacology*; D007150:Immunohistochemistry; D007668:Kidney / Q000503:physiopathology / Q000601:surgery; D008125:Locus Coeruleus / Q000187:drug effects / Q000378:metabolism; D019808:Losartan / Q000494:pharmacology*; D008297:Male; D009392:Nephrectomy / Q000379:methods; D009474:Neurons / Q000187:drug effects* / Q000378:metabolism; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D051436:Renal Insufficiency, Chronic / Q000503:physiopathology*
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D000959:Antihypertensive Agents; D007093:Imidazoles; D016760:Proto-Oncogene Proteins c-fos; C043482:moxonidine; D019808:Losartan